docs: def stackplot(marray, seconds=None, start_time=None, ylabels=None):
      """
      will plot a stack of traces one above the other assuming
      marray.shape = numRows, numSamples
      """
      tarray = np.transpose(marray)
      stackplot_t(tarray, seconds=seconds, start_time=start_time, ylabels=ylabels)
      plt.show()